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Tech Tips  
If you have a technical tip that you would like to contribute, feel free to email: tech@widebandcommander.com
Technical Tips by Dyno Dan
Alcohol Firmware:

If you are currently running alcohol on your race vehicle and need the Wide Band Commander to show the proper air-fuel ratio for this configuration, load our optional Methanol firmware and your Wide Band Commander will give you the proper spectrum. The range in this firmware has been set from 4.5:1 to 8:1. This firmware will allow you to properly log the air-fuel ratio for your alcohol vehicle so that you can see where to tune.

    To load the firmware follow these instructions:
  1. Click here to download this Firmware (WBC 0.7 Methanol.dju in zip format)
  2. Go to the Device Menu with the Wide Band Commander plugged in and communicating.
  3. Select Update Firmware and choose the Methanol firmware

Custom Analog Settings

The Wide Band Commander is now capable of reading (2) analog inputs. If you have a unit with a serial number higher than 040604006965, you’ll be able to take advantage of some new features in the latest software release. These units are easily identified by verifying the presence of a yellow wire running along side the orange RPM input wire. Your kit may have included and extra length of yellow wire with a terminal end, this is designed to plug into the 2 pin connecter that houses the orange RPM wire.

The analog channels can be configured to show Throttle Position, Voltage, or User Defined Custom Values. The user defined custom analog input setting is designed to develop transfer functions of voltage vs. output values. Be sure to download the latest tutorials for a demonstration. You can also download the “WBC Sensor Calculator” to automatically generate a custom transfer function for currently supported sensors.

Common uses of the user defined custom setting would be for showing boost or fuel pressure. Let us know if you have data on a sensor that you’d like to use and we’ll add it to the “WBC Sensor Calculator”.

If you would like Dynojet to modify your Wide Band Commander to include the second Analog Input, click here.  *NOTE* The second analog input is not recorded to the internal memory but can be recorded, through the software, to a personal computer.

A common application would be to add a MAP sensor to monitor boost. We have found that the GM 3 bar MAP sensor works well and is readily available.

12223861 - 3 Bar MAP sensor
15305891 - pigtail harness

There are 3 pins on the MAP sensor, labeled ABC (you can buy a pigtail on GM Parts Direct).
A = ground
B = 0-5v output
C = 5v reference

You'll need to find a 5v source, like one found at the TPS sensor, and send it over to pin C. This will provide power to the MAP sensor. You'll want to find a decent ground for pin A, and then pin B will act as a 0-5v output. Since the Wide Band Commander has (2) analog inputs, you can send the signal from pin B to either of these inputs.

The latest software download includes a "sensor calculator". Simply pick the sensor "GM 3 bar", and the appropriate data will come up. When you go into the analog set up in the WBC software, you'll enter this data. Since we all live at different elevations and thus have different absolute pressures, it's advised to get a "zero setting". Set the analog channel that is wired to the MAP sensor to display voltage. With the key on, engine off, record the voltage. This voltage should be entered in the sensor calculator to provide the software a proper zero reference.

Stable TPS Readings

Proper grounding is essential to ensure a stable TPS reading. If you have noticed that your TPS reading is a bit “jumpy” with the throttle closed, it’s most likely caused by a poor ground. To get the best possible TPS reading on the Wide Band Commander, connect the black / white ground wire to the TPS ground and the black heater ground wire to the engine or battery cable.

Warning Light Options

The WBC is configured to drive an LED warning light. If you would like to source an LED, be sure that it draws less than 40 mA. The warning light output is a sink to ground with 300 ohm series resistor. You should be able to wire an LED directly to the WBC harness without the need of adding a resistor. Here is an inexpensive ($2.19) LED from Radio Shack (Catalog # 276-270).diagram

Hook up is easy! Locate the supplied length of yellow wire with the terminal end and simply plug it into the open hole on the gauge harness connector. You should run this yellow wired to the ground on the LED. Run a 12v source to the positive side of the LED and you are ready to go. To configure the LED on/off conditions, simply open the WBC software and open the warning light detail in "Device Settings".


RPM Signal Options

The WBC is looking for a square wave pulse from the negative side of a 0-12v circuit. On most vehicles you'll be able to tie into the negative side of the coil and find a stable signal. This would apply to a single coil system, multiple coil packs, or even coil-on-plug systems. If you are having difficulty finding this type of source on your vehicle, you can use the negative side of the fuel injector circuit. This actually works as well as referencing the coil, if not better in some cases!

Remember, you'll still need to experiment with the sensitivity and RPM divisor in "Device Settings" to find the proper configuration.

Holley Commander 950 Pro Engine Management System

If you are using the Holley Engine Management system and need a wide band oxygen sensor input, it can be achieved through the Data Acquisition output on the Wide Band Commander. When attached to the purple O2 sensor wire in the Holley harness, the system will receive the 0-5 volt reading that it needs from the wide band sensor. The voltage versus air-fuel ratio can be referenced from our spreadsheet posted in the "Data Acquisition Output Transfer Function" section.


Data Acquisition Output Transfer Function

Click here to download a spreadsheet for the transfer function of voltage vs. A/F. (Microsoft Excel format .xls)


Technical Tips by Dyno Dan
HEI system for WBC

GM vehicles that use an HEI system can easily source a tachometer pick-up for the WBC. Simply tap the orange wire from the WBC into the "tach out" on the distributor, and then set the "RPM divisor to 4 in the software.


LS1 / LS6 TPS Signal

LS1 / LS6 have two sensors but they are combined into one box and there is a single connector.
It is a 6-wire connector at the passenger side of the throttle body. The wires are:

A DK GRN/WHT - TPS1 5V reference

B PPL - TPS1 ground

C DK BLU - TPS1 signal

D YEL/BLK - TPS2 5V reference

E WHT - TPS2 ground

F PNK - TPS2 signal

You have to connect the WBC TPS wire to the dark blue wire (C - TPS1 signal).

LS1 / LS6 Tach Signal

There is a white wire that runs from the PCM to the gauge cluster. This is the factory tach driver and it works quite well as an RPM source for the WBC. It's best to check a service manual to properly identify this wire.


Technical Tips by Dyno Dan
1999 - 2004 Lightning, 1999 - 2004 Mustang/Cobra

There are a couple of different places to get a tach signal on the 1999-2004 Lightning. Since the Lightning uses "COP" ignition, you can tap into any one of the eight harnesses that run to the coils. Each coil has 2 wires running to it, you're looking for the (-) negative lead, which should be the smaller gauge of the two wires. The other source would be from the fuel injector leads. You can tap into a (-) negative lead and acquire a signal.

In both of these scenarios, you can use a "Divisor of 1" and high "Sensitivity" in the "Device Settings" area of the software.

If you have an EVTM manual from Ford, you may be able to find the pin out schematic for the EEC's outputs. This would be rather convenient, as you wouldn't have to pass the RPM and TPS wires through the firewall.


Technical Tips by Dyno Dan
G35 / 350z

These vehicles utilize a "COP" (coil on plug) ignition system that has 3 wires leading to each coil. You should notice a black wire in the harness leading to each coil, this is the (-) negative lead that will drive the WBC tach input.

Thanks to Tommy at http://www.dfwg35.com/ for the insight on his application.

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